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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments [Abstract]  
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments
At December 31, 2015
  
   
Amortized
    
Unrealized
    
Unrealized
    
Market
    
OTTI in AOCI
  
(Dollars in thousands)
  
Cost
    
Appreciation
    
Depreciation
    
Value
    
(a)
  
Fixed maturity securities
                    
U.S. Treasury securities and obligations of
                    
U.S. government agencies and corporations
  
$
329,281
    
$
2,422
    
$
(718
)
  
$
330,985
    
$
-
  
Obligations of U.S. states and political subdivisions
    
669,945
      
34,020
      
(890
)
    
703,075
      
-
  
Corporate securities
    
2,011,997
      
27,286
      
(70,725
)
    
1,968,558
      
(86
)
Asset-backed securities
    
145,755
      
290
      
(1,063
)
    
144,982
      
-
  
Mortgage-backed securities
                                        
Commercial
    
61,527
      
1,430
      
(511
)
    
62,446
      
-
  
Agency residential
    
714,907
      
3,994
      
(6,603
)
    
712,298
      
-
  
Non-agency residential
    
126
      
24
      
-
      
150
      
-
  
Foreign government securities
    
447,244
      
24,255
      
(8,425
)
    
463,074
      
-
  
Foreign corporate securities
    
954,690
      
27,616
      
(11,397
)
    
970,909
      
17
  
Total fixed maturity securities
  
$
5,335,472
    
$
121,337
    
$
(100,332
)
  
$
5,356,477
    
$
(69
)
Equity securities
  
$
-
    
$
-
    
$
-
    
$
-
    
$
-
  



   
At December 31, 2014
  
   
Amortized
    
Unrealized
    
Unrealized
    
Market
    
OTTI in AOCI
  
(Dollars in thousands)
  
Cost
    
Appreciation
    
Depreciation
    
Value
    
(a)
  
Fixed maturity securities
                    
U.S. Treasury securities and obligations of
                    
U.S. government agencies and corporations
  
$
135,724
    
$
1,416
    
$
(304
)
  
$
136,836
    
$
-
  
Obligations of U.S. states and political subdivisions
    
783,129
      
41,969
      
(626
)
    
824,472
      
-
  
Corporate securities
    
1,992,200
      
39,954
      
(53,219
)
    
1,978,935
      
(9,735
)
Asset-backed securities
    
94,470
      
727
      
(374
)
    
94,823
      
-
  
Mortgage-backed securities
                                        
Commercial
    
57,027
      
2,292
      
(51
)
    
59,268
      
-
  
Agency residential
    
596,140
      
6,697
      
(4,720
)
    
598,117
      
-
  
Non-agency residential
    
271
      
44
      
-
      
315
      
-
  
Foreign government securities
    
515,016
      
27,415
      
(5,344
)
    
537,087
      
-
  
Foreign corporate securities
    
1,061,546
      
27,832
      
(25,820
)
    
1,063,558
      
-
  
Total fixed maturity securities
  
$
5,235,523
    
$
148,346
    
$
(90,458
)
  
$
5,293,411
    
$
(9,735
)
Equity securities
  
$
15
    
$
1
    
$
-
    
$
16
    
$
-
  


(a)  Represents the amount of OTTI recognized in AOCI.  Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date.
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity
   
At December 31, 2015
    
At December 31, 2014
  
   
Amortized
    
Market
    
Amortized
    
Market
  
(Dollars in thousands)
  
Cost
    
Value
    
Cost
    
Value
  
Fixed maturity securities – available for sale
                
    Due in one year or less
  
$
330,029
    
$
330,509
    
$
385,721
    
$
384,022
  
    Due after one year through five years
    
2,617,079
      
2,618,056
      
2,387,533
      
2,369,917
  
    Due after five years through ten years
    
870,266
      
856,230
      
1,025,221
      
1,029,077
  
    Due after ten years
    
595,783
      
631,806
      
689,140
      
757,872
  
Asset-backed securities
    
145,755
      
144,982
      
94,470
      
94,823
  
Mortgage-backed securities
                                
Commercial
    
61,527
      
62,446
      
57,027
      
59,268
  
Agency residential
    
714,907
      
712,298
      
596,140
      
598,117
  
Non-agency residential
    
126
      
150
      
271
      
315
  
Total fixed maturity securities
  
$
5,335,472
    
$
5,356,477
    
$
5,235,523
    
$
5,293,411
  
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments
   
Years Ended December 31,
  
(Dollars in thousands)
  
2015
    
2014
  
Increase (decrease) during the period between the market value and cost
        
of investments carried at market value, and deferred taxes thereon:
        
Fixed maturity securities
  
$
(46,548
)
  
$
(17,697
)
Fixed maturity securities, other-than-temporary impairment
    
9,666
      
(9,735
)
Equity securities
    
(1
)
    
3
  
Change in unrealized  appreciation (depreciation), pre-tax
    
(36,883
)
    
(27,429
)
Deferred tax benefit (expense)
    
16,292
      
6,193
  
Deferred tax benefit (expense), other-than-temporary impairment
    
(3,383
)
    
3,407
  
Change in unrealized appreciation (depreciation),
                
net of deferred taxes, included in stockholder's equity
  
$
(23,974
)
  
$
(17,829
)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type
Duration of Unrealized Loss at December 31, 2015 By Security Type
  
   
Less than 12 months
    
Greater than 12 months
    
Total
  
       
Gross
        
Gross
        
Gross
  
       
Unrealized
        
Unrealized
        
Unrealized
  
(Dollars in thousands)
  
Market Value
    
Depreciation
    
Market Value
    
Depreciation
    
Market Value
    
Depreciation
  
Fixed maturity securities - available for sale
                        
U.S. Treasury securities and obligations of
                        
U.S. government agencies and corporations
  
$
216,352
    
$
(712
)
  
$
692
    
$
(6
)
  
$
217,044
    
$
(718
)
Obligations of U.S. states and political subdivisions
    
6,434
      
(84
)
    
4,917
      
(806
)
    
11,351
      
(890
)
Corporate securities
    
866,715
      
(49,034
)
    
307,215
      
(21,691
)
    
1,173,930
      
(70,725
)
Asset-backed securities
    
102,506
      
(791
)
    
28,048
      
(272
)
    
130,554
      
(1,063
)
Mortgage-backed securities
                                                
Commercial
    
26,483
      
(511
)
    
-
      
-
      
26,483
      
(511
)
Agency residential
    
320,285
      
(3,094
)
    
150,095
      
(3,509
)
    
470,380
      
(6,603
)
Non-agency residential
    
-
      
-
      
-
      
-
      
-
      
-
  
Foreign government securities
    
61,498
      
(2,182
)
    
77,911
      
(6,243
)
    
139,409
      
(8,425
)
Foreign corporate securities
    
324,904
      
(6,289
)
    
76,951
      
(5,108
)
    
401,855
      
(11,397
)
Total fixed maturity securities
  
$
1,925,177
    
$
(62,697
)
  
$
645,829
    
$
(37,635
)
  
$
2,571,006
    
$
(100,332
)
Equity securities
    
-
      
-
      
-
      
-
      
-
      
-
  
Total
  
$
1,925,177
    
$
(62,697
)
  
$
645,829
    
$
(37,635
)
  
$
2,571,006
    
$
(100,332
)
 
 
Duration of Unrealized Loss at December 31, 2014 By Security Type
  
   
Less than 12 months
    
Greater than 12 months
    
Total
  
       
Gross
        
Gross
        
Gross
  
       
Unrealized
        
Unrealized
        
Unrealized
  
(Dollars in thousands)
  
Market Value
    
Depreciation
    
Market Value
    
Depreciation
    
Market Value
    
Depreciation
  
Fixed maturity securities - available for sale
                        
U.S. Treasury securities and obligations of
                        
U.S. government agencies and corporations
  
$
13,187
    
$
(20
)
  
$
26,897
    
$
(284
)
  
$
40,084
    
$
(304
)
Obligations of U.S. states and political subdivisions
    
20,428
      
(242
)
    
18,199
      
(384
)
    
38,627
      
(626
)
Corporate securities
    
830,928
      
(48,891
)
    
171,207
      
(4,328
)
    
1,002,135
      
(53,219
)
Asset-backed securities
    
62,451
      
(374
)
    
-
      
-
      
62,451
      
(374
)
Mortgage-backed securities
                                                
Commercial
    
11,742
      
(51
)
    
-
      
-
      
11,742
      
(51
)
Agency residential
    
24,230
      
(59
)
    
267,824
      
(4,661
)
    
292,054
      
(4,720
)
Non-agency residential
    
-
      
-
      
-
      
-
      
-
      
-
  
Foreign government securities
    
45,521
      
(913
)
    
53,086
      
(4,431
)
    
98,607
      
(5,344
)
Foreign corporate securities
    
228,733
      
(21,704
)
    
117,713
      
(4,116
)
    
346,446
      
(25,820
)
Total fixed maturity securities
  
$
1,237,220
    
$
(72,254
)
  
$
654,926
    
$
(18,204
)
  
$
1,892,146
    
$
(90,458
)
Equity securities
    
-
      
-
      
-
      
-
      
-
      
-
  
Total
  
$
1,237,220
    
$
(72,254
)
  
$
654,926
    
$
(18,204
)
  
$
1,892,146
    
$
(90,458
)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity
Duration of Unrealized Loss at December 31, 2015 By Maturity
  
   
Less than 12 months
    
Greater than 12 months
    
Total
  
       
Gross
        
Gross
        
Gross
  
       
Unrealized
        
Unrealized
        
Unrealized
  
(Dollars in thousands)
  
Market Value
    
Depreciation
    
Market Value
    
Depreciation
    
Market Value
    
Depreciation
  
Fixed maturity securities
                        
Due in one year or less
  
$
21,780
    
$
(1,577
)
  
$
12,212
    
$
(1,171
)
  
$
33,992
    
$
(2,748
)
Due in one year through five years
    
1,023,437
      
(23,255
)
    
347,203
      
(21,582
)
    
1,370,640
      
(44,837
)
Due in five years through ten years
    
394,978
      
(31,423
)
    
99,335
      
(10,131
)
    
494,313
      
(41,554
)
Due after ten years
    
35,708
      
(2,046
)
    
8,936
      
(970
)
    
44,644
      
(3,016
)
Asset-backed securities
    
102,506
      
(791
)
    
28,048
      
(272
)
    
130,554
      
(1,063
)
Mortgage-backed securities
    
346,768
      
(3,605
)
    
150,095
      
(3,509
)
    
496,863
      
(7,114
)
Total fixed maturity securities
  
$
1,925,177
    
$
(62,697
)
  
$
645,829
    
$
(37,635
)
  
$
2,571,006
    
$
(100,332
)
 
 
Duration of Unrealized Loss at December 31, 2014 By Maturity
  
   
Less than 12 months
    
Greater than 12 months
    
Total
  
       
Gross
        
Gross
        
Gross
  
       
Unrealized
        
Unrealized
        
Unrealized
  
(Dollars in thousands)
  
Market Value
    
Depreciation
    
Market Value
    
Depreciation
    
Market Value
    
Depreciation
  
Fixed maturity securities
                        
Due in one year or less
  
$
12,858
    
$
(550
)
  
$
53,528
    
$
(4,224
)
  
$
66,386
    
$
(4,774
)
Due in one year through five years
    
622,137
      
(51,262
)
    
243,192
      
(6,306
)
    
865,329
      
(57,568
)
Due in five years through ten years
    
467,187
      
(18,958
)
    
66,630
      
(2,018
)
    
533,817
      
(20,976
)
Due after ten years
    
36,615
      
(1,000
)
    
23,752
      
(995
)
    
60,367
      
(1,995
)
Asset-backed securities
    
62,451
      
(374
)
    
-
      
-
      
62,451
      
(374
)
Mortgage-backed securities
    
35,972
      
(110
)
    
267,824
      
(4,661
)
    
303,796
      
(4,771
)
Total fixed maturity securities
  
$
1,237,220
    
$
(72,254
)
  
$
654,926
    
$
(18,204
)
  
$
1,892,146
    
$
(90,458
)
Summary Of Components Of Net Investment Income
   
Years Ended December 31,
  
(Dollars in thousands)
  
2015
    
2014
    
2013
  
Fixed maturities
  
$
188,300
    
$
207,861
    
$
210,416
  
Equity securities
    
34,418
      
34,112
      
36,274
  
Short-term investments and cash
    
964
      
1,190
      
1,090
  
Other invested assets
                        
Limited partnerships
    
19,613
      
29,653
      
36,737
  
Dividends from Parent's shares
    
38,880
      
31,104
      
21,287
  
Other
    
1,804
      
3,620
      
7,328
  
Gross investment income before adjustments
    
283,979
      
307,540
      
313,132
  
Funds held interest income (expense)
    
5,611
      
5,429
      
6,925
  
Interest income from Parent
    
4,300
      
-
      
-
  
Gross investment income
    
293,890
      
312,969
      
320,057
  
Investment expenses
    
(20,637
)
    
(22,658
)
    
(23,061
)
Net investment income
  
$
273,253
    
$
290,310
    
$
296,996
  
                         
(Some amounts may not reconcile due to rounding.)
                        
Summary Of Components Of Net Realized Capital Gains (Losses)
   
Years Ended December 31,
  
(Dollars in thousands)
  
2015
    
2014
    
2013
  
Fixed maturity securities, market value:
            
Other-than-temporary impairments
  
$
(78,833
)
  
$
(38,912
)
  
$
-
  
Gains (losses) from sales
    
(36,299
)
    
(2,711
)
    
3,792
  
Fixed maturity securities, fair value:
                        
Gain (losses) from sales
    
25
      
(3,137
)
    
201
  
Gains (losses) from fair value adjustments
    
(44
)
    
(1,498
)
    
307
  
Equity securities, market value:
                        
Gains (losses) from sales
    
1
      
-
      
-
  
Equity securities, fair value:
                        
Gains (losses) from sales
    
(8,010
)
    
(385
)
    
31,566
  
Gains (losses) from fair value adjustments
    
(39,119
)
    
113,065
      
240,927
  
Other invested assets, fair value:
                        
Gains (losses) from exchange
    
88,354
      
-
      
-
  
Gains (losses) from fair value adjustments
    
29,549
      
140,259
      
446,341
  
Gain on sale of subsidiary
    
94,704
      
-
      
-
  
Short-term investment gains (losses)
    
7
      
(2
)
    
15
  
Total net realized capital gains (losses)
  
$
50,335
    
$
206,679
    
$
723,149
  
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities
   
Years Ended December 31,
  
(Dollars in thousands)
  
2015
    
2014
    
2013
  
Proceeds from sales of fixed maturity securities
  
$
546,779
    
$
1,116,743
    
$
619,914
  
Gross gains from sales
    
10,935
      
14,782
      
14,914
  
Gross losses from sales
    
(47,209
)
    
(20,630
)
    
(10,921
)
                         
Proceeds from sales of equity securities
  
$
567,085
    
$
528,958
    
$
612,516
  
Gross gains from sales
    
26,136
      
17,921
      
40,191
  
Gross losses from sales
    
(34,146
)
    
(18,306
)
    
(8,925
)